阿摩線上測驗
13. Quasars _____ emitting extremely intense radio waves and visible radiation.
(A) are star-like objects
(B) star-like objects are
(C) star-like, they are objects
(D) are they star-like objects
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統計： A(178), B(34), C(7), D(4), E(0) #2379607
統計： A(178), B(34), C(7), D(4), E(0) #2379607